Draft regulator



6. MOSS Aug. 31 1926.

DRAFT REGULATOR Filed March 30, 1926 g'nvvmlfo'c; llvind Moss,

Quorum Patented Aug. 31 1926);

orvrivn MOSS, or BERGEN,NORWAY.

DRAFT REGULATOR.

Application filed March so, 1926. swarm. 98,590.

The inventionrelates to draft regulators for furnaces and especially those of the type of boiler furnaces, where the products of combustion are conductedt-hrough lire tubes to a chamber from which flues lead the gases elsewhere. The invention is particularly useful in marine boilers, an embodiment of whichis here indicated.

ltisan object of the invention to enable the regulation of the draftinsuch manner that there will be unobstructed access of air to the fuel, while the escape of the com bustion gases is regulated according to the requirements of theservice, or exigencies.

Another object is to prevent. the gases of combustion from being cooled oif against the wallsof the soot box, but are retained closely against the boiler front with .the purpose of more efficiently utilizing the heat in the gases At the same time the gases will still serve to induce proper draft in the chimney or funnel by reason of their expanded state.

It is also a purpose to present a novel construction in a particular apparatus for aci complishing the ends of the invention, es-

pecially applicable to an ordinary boiler installation *ithoutrequiringmodification of the boiler or flue structures, or necessitating more space other than is ordinarily occupied by "such installations.

Additional objects, advantagesand fea tures of invention may be apparent from the construction, arrangementand combination of parts involved in the embodiment of the invention,.=as will appear from the following description and accompanying drawings, in which Figure 1 is a front elevation of a boiler 10 and soot box 11 in which my invention is installed, one door 12 of the box 11 being removed and parts broken away to show elements behind.

Figure 2 is a fragmentary vertical sectional view longitudinally of the boiler, showing the parts of Figure 1.

Figure 3 is a top view of the regulator structure isolated.

Figure 4: is a detail rear elevation of the fastening for the swinging plate section in the device.

Referring more particularly to the details, a bipartite'plate (at) including upper and lower sections, ordinarily formed of quarter-inch sheet iron is suspended from two horizontal angle irons (b) by a slidable mounting including trunnions (0) of a head piece (it) to be described. The plate is shaped to conforintoithe sootbox as far as -1)1'acticable,. =ancl the lower section may be further subdividedif required. The'plate (0;) 'is shaped particularly to correspond to the group form of the tubes 13. of the boiler, which are indicated behind the plate in Figure 1. Thelower section of the plate in the presentinstance is equal in area to the transverse cross sectional dimensions of one group of-tubes and corresponds to the shape of the group as viewed fromone end. This lower section of theplate (a) is connected with the upper section by hinges (e) in suchdnannerth-at the lower section may be swungoutwardly through the door opening of the soot boxtoward a horizontal position where it will-not interfere with the operation of'tube cleaning devices, removal ofsoot, or access to theboiler head for other purposes. The hinge mem bers are preferably connected by pint-1e bolts and nuts for practical reasons.

' Means is provided'to adjust theplate (a) i from without the soot box consisting in a iiatthreaded screw f) with a correspondingly grooved sleeve (9) riveted to the upper section of the plate (a) which is re inforced by the beforementioned headpiece (h) extending along its upper edge and having the trunnions (0) formed thereon. The screw is provided with an .apron or flange held between thrust .rings (is) and (Z) on each side of the flange and which are secured togetherand to the wall-ofthe' soot box over the door opening.

To prevent the adjustment of the regulator from being changed by casual or ordinary mischievous operation, the screw is formed with a squared outer end (m) requiring the use of a loose crank handle for its operation.

Adjustment of the plate (a)'with respect to the boiler is secured by rotating the screw so as to draw or push the sleeve, thereby moving similarly both sections of the plate (a) as one from or toward the boiler, while held. parallel to the boiler head, the tenons (a) sliding on the bars (7)) The lower section of the plate is held releasably in rigid alinement with the upper section by a locking contrivance consisting of a screw and hand nut (a), the nut being at the front of the plate, the screw passing therethrough and having a cross piece (0) which may be drawn against a-vertically slottedplatetp) fixed to the upper section of the plate (a) or when turned to aline with the slot in the plate (p), may swing forwardly with the lower section 'of the plate (a). I

By the construction and arrangement shown the draft may be regulated at the outlet of the fire tubes from theboiler, and thereby a substantial improvement in utilization of the fuel attained, for, by checking the discharge of. the gases to the stack or a-funnel they can be revented. from escaping permitting unobstructed access of air prop-' mingling'of air and at-toohigh a temperature; 7

'Further, it is made possible to turn a greater account the heating surfaces ofcombustion chambers and smoke ipipes,as, by

structure, asectional plate including an upper section having a slidable mounting for movement'toward andaway from the boiled head, and fixed inparallelism to said head, means to move the plate, the lower section of the plate being hinged to the upper, and releasable means to secure the lower section in fixed operative relation'to the uppersection, the said means to move the plate comprising a .revoluble member alined with the path of operative movement of the plate and having screw threaded en gagement with the movable element of the mounting of the plate'and exposed for operation exteriorly of the furnace structure.

2. In draft regulator of the character described, for boiler furnaces, a plate paral- .lel to theboiler head, two guides arranged parallel to the longitudinal axis of the boiler and at the upper side of the path of the plate, tenons carried by the plate resting on the guides, an interiorly threaded sleeve fixed upon the outer side, of the plate, a screw engaged in the sleeve and mounted against longitudinal. movement and exposed exteriorly of the furnace structure for operation.

3. A draft regulating device for boiler furnaces ofthe character described, com-' prising aplate having an upper section mounted for movement in parallelism toward and away from the boiler head anda lower .section'hing'ed thereto, a T headed bolt engaged through the lower section having its head at the inner side of the "plate,

Y and a slotted plate fixed on the upper sec-- tion of the first named plate and extending downwardly to receive the head of the bolt therethrough in one position and to be clamped by the head of the bolt in analternate position, means bearing-on the front of the said lower section to draw the bolt against the slotted plate, and means to mov the upper section as described.

4-. In a boiler having fire tubes a soot box' and clean out doors alined with tube groups; a damper plate having a mounting for movement to and from the boiler head within the soot box in parallelism to the boiler head and includinga principal portion having a hinge mounting and being shaped, positioned, and constructed to swing outwardly from the boiler through the clean-out door there-adjacent, releasable means to fix the said principal portion against movement on the hinge mounting, and means to move the plate toward and way from the boiler head; A In testimony whereof I afiix my signature.

oiviun Moss. 

